Semi-automatic exchange system.



A. M. B'ULLARD. SEMI-AUTOMATIC EXCHANGE SYSTEM.

APPLICATION FILED AUG4| 1908.

Patented July 6, 1915.

19 SHEETS-SHEET I.

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A. M. BULLARD.

SEMI-AUTOMATIC EXCHANGE SYSTEM.

APPLICATION FILED AUG.4. 1908. 1,144,997. Patented July 6, 1915.

, 19 SHEETS-SHEET I A. IvI. BULL/IRD.

SEMI-AUTOMATIC EXCHANGE SYSTEM.

APPLICATION FILED AUG.4. 190e.'

1,144,997. PatentedJuIy 6,1915.

'I9 SHEETS-SHEET 4- l A. Nl. BULLAHD.

SEMI-AUTOMATIC EXCHANGE SYSTEM.

APPLICATION FILED Aue.4. I9o8.

Patented. July 6, 1915.

19 SHEETS-SHEET 5.

A. IVI. BULLARD.

SEM-AUTOMATIC EXCHANGE SYSTEM.

' APPLICATION FILED AUG.4, I903. 1,144,997, Patented July 6, 1915. l 19SHEETS-SHEET 6.

A'. M. BULLAHD.

SEMI-AUTOMATIC EXCHANGE SYSTEM.

APPLICATION FILED /Iue.4. 1908.

1,144,997 Patented July 6, 1915.

A. M. BULLARD.

SEMI-AUTOMATIC EXCHANGE SYSTEM. I

k,APPLICATION FILED AUG.4, 1908.

Patented July 6, 1915.

19 SHEETS-SHEET 8.

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l APPLICATION FILED A'UG.4| |908- A 1,144,997. v Patented July 6, 1915.

I9 SHEETS-SHEET 9.

A. M. BULLARD. I SEMI-AUTOMATIC EXCHANGE SYSTEM.

Pate'ntedJuly 6,1915.

19 SHEETS-SHEET 10.

A *nl 7 9 9 A. M. BULLARD. SEMI-AUTOMATIC EXCHANGE SYSTEM.

I APPLICATION FILED UG.4, 1908. 1,144,997. Patented July 6,1915.-

19 SHEETS-'SHEET n.

' A. IvI. BULL/IRD.

- SEMITAUTOMATIC EXCHANGE SYSTEM.

APPLICATION FILED AuG.4, 1908.

Patented July 6, 1915.

I9 SHEETS-SHEET l2.

A. M. BULLARD.

SEMI-AUTOMATIC EXCHANGE SYSTEM. APPLICATION FILED'AUGA. 190s.

1,144,997. Patented July 6, 1915.

' vi 19 SHEETS-SHEET ls.

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SEMI-AUTOMATIC EXCHANGE SYSTEM. APPLICATION FILED Aue. 4. 190s.

Patented July 6, 1915.

19 SHEETS-SHEET I4.

A. M.`BULLARD. SEMI-AUTOMATIC EX'CHANGE SYSTEM.

I APPLICATION FILED AUG-4.1908.

Patented July 6, l1915 19 SHEETS-SHEET I5.

A. M. BULLARD.

SEMI-AUTOMATIC EXCHANGE SYSTEM.' APPmcATloN FILED Aus.4, |908.

Patented my `6, 1915.

i9 SHEETS-SHEET.16.

703W MA Ram/AL Patented July 6, 1915.

I9 SHEETS-SHEET 17.

A. M. lBULLARU. SEMI-AUTOMATIC EXCHANGE SYSTEM. APPLICATION HLED AuG.4,1908.

Af Nl. BULLARD.

SEMI-AUTOMATIC EXCHANGE SYSTEM.

APPLlcATloN f'lLED AUGA. 190s. l

. Patented July 6, 1915.

- 19"sHEETs-SHEET18.

A. Nl. BULLARD. SEMI-AUTOMATIC EXCHANGE SYSTEM.

APPLICATION FILE') AUG.4, 1908. 1,144,997.. 4 A Patented July 6, 1915..

\ 19 SHEETS-SHEET19.

ansiosi.

ALBERT M. BULLARD, GF Einw' 'YSL-RK, l'. Y., SSIGNGR TG XVESTERNELECTRIC COMPANY, OF CHICG,

SElllilI-TOMTC @HCH T0 all whom it may concern Be it known that Lcitizen of the nitei States, resi 1ing York, in the county ci New YY i-.snc c of New York, have inventer?. and useful improvement in o, ExchangeSystems, oi which y is a full, clear, concise, and

, rlhis invention relates to ai' switching system for telephone anzimore particularly to a system in operator at the central otlice, ing acall, may cause the calling" line automatically switched into connectionany line Wantecl, Whether origi oiice or in a clistant cnice, by mereiyact1W ing a corresponcling` combination oi keys. Certain keys designateoiiieee or .and a bank of number keys, of an adding machine, ycombinations requireclL to rc' et, number oi1 the system. The circ-.cessively extended from the cali; b operators connecting; circuit thries of automatic selectors, lector is reached which direct access tethe line Wanted. The various selectors successively controllelby lsenclin tus governed by the depressed keys having set up a connection,the paratus is automatically disconnected L the circuit which it hascausati be este lished, leaving the latter free tor telenT transmission,the sending apparatus be, f immediately available to set up another connecti'on.

' A system havingsuch general istics is described in a xjoint applicat nor James L. McQuarrie and myseif, Serial No. 336,401, led September27th, i906.

The present invention relates to asyst-em involving the use cianimproved type ci: selector switch and improves); sending nzeelfin anism;further objects being to secure increased eiiciencyjfspeefl and accuracyin making connections, and in general to provide improved means iormeet'ng all the manifold requirements of a practical system, imposed byoperating conditions: Without attempting to descrlbeor even enumerate"thesevarious im rovements @scent bw ratei1- ence to a specific systemembodying them in. Lconcrete form, will direct attention to eerMELLL'NQBS, CRPRATIN OF ILLINOIS.

yatenteri fiiiy 6, i915.

Serial l o. 195,955.

'ters f'atent.

. A"ures or characteristics yv'hich ccgnizecl will assist one morereadily ovv the ietailed description.

any operators connecting circuit is or use, one of the senders "-.vhichis ine time is automatically seized by onnecting circuit. While thesender is busy, another sender is autocany made available for any ci'the reconoci-ing circuits which may be setting up one connection it isimme- 7 nnfiertake another.

er system shown there are two sendiprimary7 and snbsiciiary-avail set ofoperators connecting or cironits. llihen any of these conemits is pntinto use (as by the of the plug in a sprin jack and e activist/ion' ofthe listening key the prisender if free is seizecl by thatconnectircuit. if the primary sender is busy nhsiciiary sender if freewill be or., are busy ggnarci signal will be displayed rning to theoperator until one or the t ireeel.

i feature ci system is that for select-v trnnk leacling to desireddistant e is a single olice sender, comsilice keys l anti etlicecontroly iieh may be as a part of either mary sender or subsidiarysender; an iatic transfer mechanism being artc shift the oilice senflerto "the leads nbsitliary sencler when the primary s in use, anal viceversa. proyiflecl to Warn the operator When e sender is busy, but thissender iini work or" governing selection of a air very quickly anti is'free' long' before selection of the desired snbscribers line iseornpieteei. Although there are two namseniers, only a single set ofnumber keys "be seized. by another corri circuit.

As a means for bringing about the reanirefi A. guard l sequence ofsencier cperations,

into use and as soon as any sender iinin the in the rare case when vbothsendv y ies

